Inorganic Chemistry Seminar, Dr. Ken Hanson (Florida State University)

February 13, 2018 - 12:00 PM - 01:00 PM
Speaker: 
Host: Schelter
Location: 
Carol Lynch Lecture Hall Chemistry Complex
Attached Document: 

Title  : Harnessing Molecular Photon Upconversion Using Self-Assembled Multilayers on Metal Oxide Surfaces

Abstract:

Photon upconversion—combining two or more low energy photons to generate a higher energy excited state—is an intriguing strategy for increasing the maximum theoretical solar cell efficiencies from 33% to greater than 43%. In this presentation we will introduce self-assembled multilayers of sensitizer and acceptor molecules on nanocrystalline metal oxide films as a new structural motif for facilitating molecular photon upconversion via triplet-triplet annihilation (TTA-UC) and directly extracting charge from the upconverted state. Under light intensities as low as ambient solar flux we demonstrate a more than four-fold increase in the short circuit current relative to the sum of the sensitizer and acceptor monolayer devices. We will discuss the dynamics events during TTA-UC, limitations of the current film, and strategies for increasing the TTA-UC efficiency and device performance.

 

Inquires please contact Rosa M. Vargas rvargas@sas.upenn.edu

Department of Chemistry

231 S. 34 Street, Philadelphia, PA 19104-6323

215.898.8317 voice | 215.573.2112 fax | web@chem.upenn.edu